INVESTIGATION ON SEED PRODUCTION TECHNOLOGY FOR SINGLE CROSS MAIZE HYBRIDS (Zea mays L.) (NAH-2049 AND NAH-1137)
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Date
2015-10-06
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, BENGALURU
Abstract
To standardize seed production technology VlZ., planting ratios, synchronization of parental lines, optimum screen size, storage potential and identify suitable morphological and DNA marker for hybrid purity testing experiments were carried out for newly released two single cross maize hybrids NAH-2049 (Nithyashree) and NAH-1137 (Hema) at NSP, GKVK and ZARS, VC Farm Mandya during 2010 to 2013.
Between the hybrids, Hema (52.84 and 54.42q/ha) recorded the highest seed yield compared to Nithyashree (32.59 and 33.71q/ha) at GKVK and Mandya, respectively. However between the locations, GKVK (41.64 and 39.08q/ha) was found to be more suitable place for seed production than Mandya (39.08 and 38.55q/ha) during kharif and rabi, respectively.
Hema seed production in 4: 1 ratio with combined application of ZnSQ4 and FeSQ4 10kg each recorded highest seed yield at GKVK (61.40 and 58.02q/ha) and Mandya (67.66 and 59.56q/ha), similarly in Nithyashree at GKVK (31.20 and 30.39q/ha) and Mandya (30.66 and 28 .19q/ ha) during kharif and rabi, respectively. Sowing of male parent by two days late than female parent in Nithyashree (34.20 and 36.30q/ha) and 2 days early sowing of male parent in Hema (59.97 and 59.6q/ha) showed significantly higher seed yields as well as quality during GKVK and Mandya, respectively.
The grading of SKV-50 (98.58%), MAI-105 (98.14%), NAH-2049 (98.59%) and NAH-1137 (99,79%) by using sieve size 4.00mm(S) recorded highest seed recovery while NAI-137 (96.37%) by using 6.40mm(R). The seed treatment with Spinosad @ 0.04ml/kg of seed maintained minimum germination (80%) in SKV-O, NAI-137 and NAH- 2049 for ten months and MAI-105 for eight months of storage period. Polymorphic specific SSR markers viz., bnlgl 178 for NAH-2049 and phiOOl, phi435417 and umc2362 of NAH-1137 could be used for purity assessment of single cross millZe hybrids.
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